How to use a digital multimeter to measure leakage
1. Power off measurement: Turn off and disconnect all electrical appliances, use a multimeter RX10K gear, with one probe receiving the live wire and the other probe grounded (or faucet). The resistance should show infinite, otherwise there will be leakage.
2. Live measurement: Use a multimeter with a voltage range of 250 volts AC to measure the metal casing of the electrical appliance suspected of leakage. Connect one probe to the casing and the other probe to ground (or tap). When the pointer displays a voltage between 30-50 volts, switch to the AC 50 volt range. If the power supply confirms that it is leakage above 30 volts and normal below 30 volts, then swap the zero and fire power supply plug wires and measure again to confirm.
3. Leakage measurement between live wire and neutral wire (or live wire and live wire): Turn off and disconnect all electrical appliances, measure the resistance between live wire and neutral wire, which should be infinite, otherwise it is leakage.
A multimeter can not only be used to measure the resistance of the object being measured, but also to measure AC and DC voltages. Even some multimeters can measure the main parameters of transistors and the capacitance of capacitors. Fully mastering the usage of a multimeter is one of the most fundamental skills in electronic technology.
Common multimeters include pointer multimeters and digital multimeters. A pointer type multimeter is a multifunctional measuring instrument with the meter head as the core component, and the measured values are read by the pointer on the meter head. The measured values of a digital multimeter are directly displayed in digital form on the LCD screen, making it easy to read. Some even have voice prompts. A multimeter is an instrument that uses a common meter head and integrates a voltmeter, ammeter, and ohmmeter.
The DC current range of a multimeter is a multi range DC voltmeter. The parallel connection of a closed circuit voltage divider resistor in the meter head can expand its voltage range. The DC voltage range of a multimeter is a multi range DC voltmeter. Connecting a voltage divider resistor in series with the meter head can expand its voltage range. The corresponding range varies depending on the voltage divider resistor. The head of a multimeter is for magneto electric measurement, which can only measure AC power by converting AC to DC using diodes.
